Stone-drilling engine



` G. H. GILVIAN.

STONE DRILLING EN|NE. APPLICATION FILED MAR. 20, 1912.

1,382,775, Patented June 28, 1921.

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I I a I 33 9 I r 5 35 I I /e 3 III II Ii! 5 I I Witnesses.- 6 [avea/dor.- mxjowte Georegefn/aan, mdwm'v/ UNITED vs'rA'rEs PATENT t OFFICE,

1 GEORGE E. GILMAN, OF CLAREMONT, NEW HAMPSHIRE, AssrGNOR, BY MEsNE AssoIeNMEN'rs, To SULLIVAN MACHINERY COMPANY, or BosroN, MASSACHU- sETrrs, A CORPORATION OE MAssACHusETTs.

STONE-DRILLING- ENGINE.

Specification of Letters Patent.

Patented June 28, i921.

Application filed. March 20, 1912. I Serial No. 684,970.

To all whom t may concern.'

Be it known that I, GEORGE H. GILMAN, `a citizen of the United States, residing 'at Claremont, in the county of Sullivan and State of New Hampshire, have invented an Improvement in Stone-Drilling Engines, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.

This invention relates to stone working machines, and more particularly, though not exclusively, to stone or rock drilling engines, the object of the invention being to provide such an engine with improved means for removing or assisting in the removal of the cuttings from the drilled hole.

The invention will be best understood by reference to the following description, when taken inconnection with the accompanying illustration of one specific lembodiment thereof, while its scope will be more particularly pointed out in the appended claims.

In the drawings,-

Figure 1 is a central longitudinal section of a hammer drill embodying the invention.

F ig. 2 is a broken transverse section on an enlarged scale taken through the regulating valve shown in Fig. 1.

Referring to the drawings and to the illustrative embodiment of the invention therein shown, I have illustrated a hammer drill of a common type having a cylinder 1 and a hammer piston 2, the latter reciprocating in the cylinder chamber 3 and adapted to deliver a hammer blow upon the end of a tool 4, or, as herein shown, upon the end of an interposed striking pin or tappet 5. The latter has an enlarged head at its forward end and a rear portion projecting into the cylinder chamber and within the path of the hammer piston, such `striking pin being an old and well-known expedient in pneumatic hammer drills and rivetersto permit the use of a tool having a straight shank.

The tool, or drill-bit, 4 is herein shown as consisting of a straight piece of steel having a hexagonal cross-section and fittingI a correspondingly shaped sleeve or bushing 6",

which latter is fiXedly held in the forward end of the cylinder member by any usual chuck or clamping device.

The rear end of the cylinder covered and closed. by the valve block consisting of the forward section 7 and the rear section 8, the two bein doweled together and to the cylinder by`t e dowel pin 9 and being seated in a chamber formed inthe head block 10 between which and the cylinder they are'securely clamped by the usual tie-rods" (not herein shown). 4

Pressure fluid is supplied to the supply chamber 12 formed in the head block, and passes thence to the supplyl passage 13 and the pressure supply space 11 in the head block throughany suitable means such as the flexible hose 12, the hose being attached to the rear of the head block, and its supplyl of pressure fluid to the supply space being regulated by a common form vof push throttle valve 14, the latter being subjected to a constant fluid pressure at its forward end and, at its rear end, to the pressure of the push handle 15, as the said handle is held by the operative and the tool forced or held to .thev

work.

Within the valve block, there is providedl movements of the piston. Any suitable form of valve may be employed,'but herein I have `shown one of a construction similar to that disclosed in my prior Patent 1,095,848, dated May 5, 1914. Pressure fluid passes to the said valve chamber from the supply space 11, through the passages 17 and isI distributed under the control of the valve alternately to opposite ends of the cylinder chamber 3.

In order to provide an efficient and'always available means for cleaning the cuttings from the drilled hole. I have provided means for supplying a regulatable quantity of live, high-pressure fluid (which is preferably compressed air, but which may be steam or other gaseous pressure fluid) to the drilled hole, where it may be utilizedjeither alone or in conjunction with water also applied thereto to expel the cuttings. Preferably, though not necessarily, as shown in the illustrative embodiment, such supply of pressure fluid is diverted from'the pressure fluid supply passage to the drill engine and may be admitted to the drilled hole through the hollow drill-bit by means 0f an axially arranged hollow feed-tube projecting through the reciprocatory hammer piston, the supplyl of such pressure Huid to the tube and the drill-bitbeing under .the control of a vcontrolling valve, which herein is adapted to be regulated. independently of the throttle valve of the engine.

To this end, the drill-bit is provided with,

a central lon itudinal passage 18, extending from end to end, which passage alines with asimilar passage in the striking pin 5, the latter being proportioned to have a sliding fit on the feed-tube 19, as has also the hammer piston 2. Such feed-tube preferably terminates as shown, within the striking pin 5, in such-a manner that its end is protected thereby andthe bore of the latter cooperates with the tube in delivering the cleansing agent to the longitudinal passage 18 in the drill bit. As shown, this feed tube 19 also extends axially through the hollow valve 16, and through a rearwardly projecting plug portion 20 on the piston, which plug portion is adapted to enter the 'controlling valve and partly fill the same on the rearward movement of the piston.

The feeding tube may be supported in any suitable way, but preferably it is held in the rear portion 8 of the valve blockupon,

a slightly yielding seat', so` as to reduce the injurious effect of the vibrations of the tool upon the tube.` 'To this end the valve block portion 8' has a pocket or recess in which there is provided a quantity of yieldable packing material 21, such as leather or rubber, and the tube is provided with a shoulder or flanged portion 22, which herein is formedby brazing to the tube `a disk-like washer or collar. 1-

To secure the tube upon its seat, the walls of the chamber-or recess in the rear valve block member are threaded to receive a clamping member 23, the forward end of which abuts against the flange 22, and by means of which the said flange may be pressed firmly down against the yielding. base 21.- The interior of the member 23 is counter-bored to provide a chamber or supplyspace 24 about the'open end of and communicating withthe feed-tube. At its forward' end it is transversely slotted at a plurality of points 25 to proyide admission to the chamber 24 of'pressure fluid from a circumferential groove 26, which latter'communicates with supply passages 27 and 28, the latter communicating directly with the p ressure supply passage 13, and herein outslde of the control of the main throttle 14. The member 23 therefore constitutes also a thimble. or cage about the open end' of thev tube admitting pressure fluid freely thereto from the groove 26. The supply of compressed a1r, or the pressure fluid entering the passage 27 passes therefore freely to the ing into the drilled hole.

ment thereof.l

the hollow drill-bitf4 to the cutting edge thereof, where it is discharged into the hole. The member 23` has a hexagonal or other suitably shaped end 404and is provided with the lock-nut 41. Y

In the illustrative embodiment of the invention, I contemplate supplying the drilled hole with water from an independent source and by means (not herein shown) outside of the drill-bit. This, for example, may be done by means of a hose or pipe discharg- To regulate the supply of pressure fluid delivered to the feed-tube, I have interposed between the feed-tube and the mainY pressure supply a separate controlling valve 29, said valve herein being interposed between the supply passages 27 and 28. The valve consists of a stem portion 29 having. a threaded part 30 engaging with a` corre- 8,5 spondingly threaded portion of the casingl 31, the latter being threaded into the head block. The valve is provided with a handle 32, by which it maybe turned and adjusted to any desired position at the will of the operator, whereby the supply of pressuile fiuid to the tube can be regulated at w1 To fix the valve-handle in its different positions of adjustment, the inner face of the 95y handle hub is notched or serrated as indicated. These notches engage with corre-` sponding notches in the outer face of the plunger 33, which plunger is seated in a chamber 35 in the casing 31, but is yield- 10o ably pressed outwardly by a spring 34. The plunger is prevented from turning in the casing by means of lugs 36-36, which slide 1 longitudinally in slots in the casing and permit the longitudinal movement of the plunger, while/ reventing rotative move- Vshen the handle is turned, g the plunger is wedged back, permitting the teeth on the'handle hub to slip o'ver the teeth on the plunger, the stem being thereby screwed in or out to close or open the supply passage. 'When the handle comes to rest, however, the teeth'of the plunger snap into the notches of the handle and lock the handle against accidental movement due to shocks or vibrations.

By the use of the described form of apparatus, particularly where employed with the independent regulating valve of the pressure fiuid supply, I am enabled to conduct a supply of pressure fluid under pipe linepressure'directly into the drilled hole, and in varying amounts, independent of the operation of the tool.- Thus as-the hole deepens, and more force is required to remove the cuttings, a greater quantity of pressure `fluid may be admitted, without in any way affecting' the operation of the tool or impairing its eiciency. I amV thusenabled to chamber 24, lnto 4the tube 19, and through vary the conditions of the pressure uid suplo plied to the drilled hole to meet the varying conditions of operation, without in any way affecting the efficient operation of the tool.

While I have herein shown and described,

.may be made therefrom, without departing from the spirit of the invention.

Claims.

l. In a rock drill, the combination with a cylinder having a p-ressure fluid supply space at the rear thereof, of a piston hammer adap-ted to strike a hammer blow,l a feed tube passing axially through the piston and communicating with the pressure fluid supp-ly space vat the rear of the cylinder, a throttle between the said tube and the pressure fluid supply space, and a second throttle between the pressure fluid supply space and the cylinder.

2. In a rock drill, the combination with a cylinder having a pressure fluid supply chamber .at the rear end thereof, of a hammer piston, a hollow controlling valve at the rear o-f said cylindera supply 'tube passing through said valve and hammer piston and opening into a pressure supply space at the rear of said valve, and means for suprplying live pressure fluid to Vsaid supply `-bit, a controlling valve for controlling thel movements of the piston, a valve block, and a feed-tube supported in said valve block and passing 'through said valve and cylinder into said drill-bit.

5. In a rock drill, the combination with a cylinder, of a hammer piston, a hollow drill-bit, a feed-tube passing through said piston and communicating with said drillit, and a yieldable part against which the l tube is clamped 6. In a rock drill, the combination with a cylinder, of a piston, a feed-tube passing through the iston, a shoulder on the feedtube, and a c amping member engaging said shoulder and clamping said tube to a seat.

7. In a rock drill, the combination with a piston, of va cylinder member, a feed-tube passing through the piston, a shoulder on the feed-tube, a seat therefor on the cylinder member, a chambered clamping member surrounding the en d of the tube and adapted to clamp said shoulder to a seat, and means to feed -iuid to the chambered clamping member.

'8. In a rock drill, the combination with a cylinder member, of a piston, a feed-tube passing through thepiston, a shoulder on the feed tube, a seat in said cylinder member for said shoulder,`and a chambered eX- teriorly threaded member engaging the cylinder member and surrounding said tube and adapted to clamp said shoulder to its seat and provided with lateral fluid admissionV openings communicatingwith said chamber.

9. In a rock drill, the combination with a cylinder, of a piston, and a feed-tube passing through the piston and having a clamping shoulder or flange.

10. In al drill, -the combination with a cylinder, of a hammer piston, a shell valve at the rear of the piston, a feed tube passing vaxially through the piston and the hollow interior of the shell valve, a fluid pressure supply chamber, a throttle valve between the same and the said shell valve, passages connecting the rear of said tube with the said pressure sup-ply chamber, and a throttle valve controlling said passages.

11. In a rock drill, the combinationwith a cylinder and'piston and a controlling valve therefor, of a fluid pressure inlet, a normally closed throttle valve interposed between the inlet and the cylinder, means operative to open said throttle valve when the drill is presented to the work, means for feeding fluid pressure from said inlet to the drill hole, and means separate from and independent of said throttle valve for controlling said feeding means.

12. In a rock drill, the combination with a cylinder vand .piston and a controlling vvalve therefor, ofy a fluid pressure inlet, a throttle valve normally held closed by the pressure v jsupplyinterposed between the inlet and the cylinder, means operative to open said throttle valve when the drill is presented to the work, means for feeding fluid pressure from said inlet to the drill hole, and means separa'te from and independent of said throttle valve for controlling said feeding means.

13. In a rock drillj, the combination with a` cylinder and `piston and a controlling valve therefor, of a fluid pressure inlet, a drill handle, a normally closed throttle valve operated by the handle and interposed between the inlet and the cylinder, means for feeding fluid pressure from said inlet to the drilled hole, and means separate fro-m and independent of said throttle valve for controlling said feeding means.

14. AIn a rock drill, the combination withk feeding iiuid pressure from said inlet to the drilled hole, and means separate from and independent of said throttle valve for controllin said feeding means.

. 15. n a rock drill, the combination of a i casing providing a pressure supply chamber,

a cyllnder and piston alined with said casing, control and throttle valves within the cross-sectional limits of the casing and cylinder forgoverning the admission of Huid fromsaid supply -chamber to said cylinder for actuating said piston,a supply conduit for feeding live pressure gaseous fluid from said supply chamber to the drilled hole also within the cross-sectional limits ofthe casing and cylinder, and a control valve separate from and independent of said throttle valve for said conduit located on the casing.

16. In a drilling machine, the combination with a cylinder member, of a piston operating therein, a closure plate for the cylinder member having a rearwardly opening socket, a tube extending through the piston member and having a fianged end located in the socket of the closure plate, a plug threaded into the socket and bearing against the flange, and means for introducing iuid into the tube 'and including lateralports opening through said plug.

17. In a drilling machine, the combination with a cylinder member, of a head block secured to the rear end thereof, a closure interposed between the head block and cylinder member and held in place thereby, said closure having a central socket, a reciprocatory piston operating in the'cylinder member, a'

tappet engaged by the piston, a tube having a flanged endv in the socket of the closure and having its other end in the tappet, means for securing the vsaid end in the socket, and means for introducing motive fluid into the tube.

18. In a drilling machine,tlie combination with a cylindermember, of a reciprocatory piston operating therein, a member carried at the rear end of said cylinder and having a 'socket therein, a tube extending into said piston and having a flanged end extending into the socket in said member,

'and means for securing the flanged end of said tube in said socket having a lateral port therein communicating with said tube.

19. In a drilling machine, the combination with a cylinder member, of a reciproeatory piston operating therein, a member carried `at the rear end of said cylinder and having a socket therein, a tube extending into said piston and having a flanged end extending.

into. the socket in said member, and 'a plug seated in said socket and engageable with the anged end of said tube having a lateral` passage therein communicating with said tube.

' 20., In a ldrilling machine, a cylinder, a reciprocatory piston operating therein, a member carried at the rear of said cylinder and having a Asocket therein, a tube extending into said piston an'd having a flanged end disposed in said socket, packing surrounding said tube andy disposed in said socket, and means for clamping said tube and packing in position in said socket.v

21. In a drilling machine, a cylinder, a piston reciprocable in said cylinder, a block secured to the rear end of said cylinder, a tube projecting into said cylinder and through said piston, means for securing one end of said tube to said block having a lateral port therein communicating with said tube, means forming a fluid passage eXtending to said port, and a valve inthe passage controlling the supply of fluid passing therethrough. j

22. In a rock drill, the combination with a cylinder having a rear head, of a feed tube extending through said cylinderv and supported in said head, said feed tube being removable through said head from the rear thereof, and means at the rear of said head for retaining said tube in position, said means when 1n operative position relative to the head preventing removal of the tube fromthe head, but upon removal from'said 24. In drilling apparatus, the combinal tion with a motor comprising a cylinder' member and a piston operating therein, of

means for delivering motive Huid to the piston to actuate it including a rear passage opening into the cylinder member, a valve controlling such passage, a hollow tool' to be operated on by the piston, and means for delivering cleansing Huid to the tool includ# ing a tube extending throu h the valve and piston and having a relatlvely fluid tight engagement with the latter. i

25. In drilling apparatus, the combination with a cylinder member having a head anda bushing arranged at the inner side of the head, of a piston operating in the cylinder member, means for supplying motive iuid to the cyllnder member through the bushing, and means for supplying cleansing Huid through the head .and'bushing to a tool operated on by the piston. y

26. In drilling apparatus, the combination with a cylinder member having a head and a bushing arranged at the inner side of the head, of a piston operating in the cylinder member, means engaged with the bushing for supplying motive fluid to the cylinder member, and a tube mounted on the head and passing through the bushing and piston to deliver cleansing fluid to a tool operated on by the piston.

27. In drilling apparatus, the combination with a cylinder member, of a piston operating therein, a tube ixedly secured at one of its ends to said cylinder and serving to supply cleansing fluid to a tool op'erated on by the piston, and means surrounding the tube for controlling the flow of motive fluid supplied to the cylinder member for actuating said piston, said piston having an area substantially equal to the entire cross sectional areay of said cylinder subjected to fluid pressure during its percussive stroke.

28. A rook drill comprising a cylinder, a piston reciprocable therein, a rear head 4for said cylinder, a hollow distributing valve distribution means for said drill comprising a valve whose axis is parallel to an element of the surface of said cylinder, .and a tube for supplying cleansing fluid to a hollow drill steel extending through said valve and piston, said piston having a longitudinal bore forming a sliding fit with said tube and having at least one end thereof an area equal to the diiferences in area between the cross sectional areas of said cylinder and of said bore exposed to fluid pressure and coperating in eecting movement of said piston.

30. Arock drill comprising a cylinder, 'a rear head therefor, a piston reciprocable in said cylinder, a fluid distribution means for said drill comprising a port vopening through the rear head of said cylinder into the frear end thereof and a hollow valve controlling said port, and a fluid supply tube extending through said piston for supplying cleansing fluid to a hollow drill steel actuated by the latter, said piston having a bore extending longitudinally thereof and providing a sliding it with said tube and having at the rear end thereof an area equal to the dif-` f ferences in area between the cross sectional areas of said cylinder and of said bore adapted to be subjected to motive iiuid for eiecting the striking of a blow by said piston and'said tube being detachably mounted in said rear head and removable axially through said hollow valve.

In testimony whereof, I have signed myd name to this specification, in the presence of two subscriblng witnesses.

GEORGE H. GILMAN.

llVitnesses:

CHAs. J. JONES, IRENE KELLEY. 

